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TPS51513RHBT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS51513RHBT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 39 page TPS51513 www.ti.com SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010 DETAILED DESCRIPTION Application Circuit List of Materials Recommended parts for key external components for the circuits in Figure 2 and Figure 3 are in Table 2. These parts have passed applications tests. Table 2. Key External Component Recommendations COMPONENT MANUFACTURER PART NUMBER TI CSD16409Q3 High-side FET(s) Infineon BSC080N03MSG TI CSD16401Q5 Low-side FET(s) Infineon BSC030N03MSG Panasonic ETQP4L series Tokin MPCG1040L series Inductors Toko FDUE10140D series Vishay IHLP5050 series Panasonic EEFSX0D331XE Bulk output capacitors Kemet T528Z series NEC Proadlizer PFAF250E127MNS Panasonic ECJ2FB0J106K Ceramic output capacitors Murata GRM21BR60J106KE19L Sense resistor (resistor sensing only) Panasonic ERJM1WTJ1M0U Panasonic ERTJ1VG103JA NTC thermistors TDK NTCG163JF103HT Functional Overview The TPS51513 is a DCAP+™ mode adaptive on-time converter. The output voltage is set using a DAC that outputs a reference in accordance with either the 3-bit VID code defined in Table 3. VID-on-the-fly transitions are supported with the slew rate controlled by a single resistor on the ISLEW pin. Powerful integrated FET drivers support output currents in excess of 25 A. The converter automatically runs in discontinuous mode to optimize light-load efficiency and battery life. The four switching frequency selections (given in Table 3) enable optimization of the power chain for the cost, size and efficiency requirements of the design. Table 3. Frequency Selection Table TONSEL FREQUENCY (fSEL) (kHz) GND 250 VREF 300 3.3 V 350 5 V 500 In adaptive on-time converters, the controller changes the on-time as a function of input and output voltage to maintain a nearly constant frequency during steady-state conditions. In conventional voltage-mode constant on-time converters, each cycle begins when the output voltage crosses to a fixed reference level. However, in the TPS51513, the cycle begins when the current feedback reaches an error voltage level which is the amplified difference between the DAC voltage and the feedback voltage. This approach has two advantages: 1. The amplifier DC gain sets an accurate linear load-line; this is required for CPU core applications. 2. The error voltage input to the PWM comparator is filtered to improve the noise performance. Copyright © 2009–2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s) :TPS51513 |
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